Final answer:
The Rising Runway symbol first appears on the VSD when the aircraft reaches a certain radar altitude. It indicates that the aircraft is approaching a higher elevation, such as a runway or terrain.
Step-by-step explanation:
The Rising Runway symbol first appears on the Vertical Situation Display (VSD) when the radar altitude reaches a certain value.
The specific altitude at which the symbol appears may vary depending on the aircraft and its equipment. In general, the Rising Runway symbol indicates that the aircraft is approaching a runway or terrain at a higher altitude than its current position.